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Routine Bloodwork Guide

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A Guide to Blood Chemistries for Kidney Dialysis Patients

(reprinted from the now defunct Colorado Health website, by permission)

Name of Test: 1. BUN (Blood Urea Nitrogen)

Normal Values:

Normal value = 7-25 MG/DL
Dialysis normal = 40-85 MG/DL
(values will vary depending on protein intake)

Causes of Abnormal Values: Causes of abnormal levels (refers to increases in):

  • eating too much protein containing food
  • could indicate need for more dialysis time
  • could indicate need for higher blood flow rate
  • could indicate need for a larger dialyzer

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • fatigue
  • nausea
  • insomnia
  • dry and/or itchy skin
  • urine-like body odor and/or breath
  • taste and smell (senses) could be affected

Name of Test: 2. Calcium (Ca)

Normal Values:

Normal value = 8.5-10.8 MG/DL Dialysis normal = (Same) 8.5-10.8 MG/DL Level is best near upper end to avoid overactive parathyroid glands.

Causes of Abnormal Values:

Causes of abnormal levels:

LOW:

  • eating too much high phosphorus food
  • not taking phosphorus binders as recommended

HIGH:

  • medications such as Rocaltrol and/or Calderol may cause sharp increase.
  • parathyroid gland removal may be indicated.

Calcium level will rise as phosphorus level decreases.

Signs and Symptoms:

Signs and symptoms associated with abnormal levels

LOW:

  • muscle twitching and cramping
  • seizures
  • varying degrees of depression
  • hair loss
  • cataracts
  • conjunctivitis (inflammation of the mucus membrane of inner eyelid)

HIGH:

  • muscle weakness
  • fatigue
  • abdominal cramps
  • loss of appetite
  • nausea and /or vomiting
  • constipation
  • possible coma if left untreated

Name of Test: 3. Calcium Phosphate Product (Ca x PO4)

Normal Values:

Normal value = 0-70
Dialysis normal = multiply calcium and phosphorus blood values, the result should not exceed 70. For example, if your calcium level were 10 and you phosphorus lever were 8, then you would have a Calcium PhosphateProduct of 80. This would be much too high. Some physicians even feel that a calcium phospate product of below 50 is desirable.

Causes of Abnormal Values:

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • High - calcification of blood vessels including coronary arteries. This over time can can cause heart attack stroke and death.

Name of Test: 4. Chloride (Cl)

Normal Values:

Normal value = 96-109 MEQ/L
Dialysis normal = Same 96 - 109 MEQ/L

Causes of Abnormal Values:

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • excessive thirst

Try to avoid such foods as

  • canned vegetables
  • potato chips, etc.
  • bacon
  • luncheon meats (bologna, salami, etc.)

Name of Test: 5. Creatinine

Definition of Creatinine/Creatinine Clearance:

Serum creatinine level and "creatinine clearance" are different ways of determining kidney function. Creatinine is a protein produced by muscle and released into the blood. The amount produced is relatively stable in a given person. The creatinine level in the serum is therefore determined by the rate it is being removed, which is roughly a measure of kidney function. If kidney function falls (say a kidney is removed to donate to a relative), the creatinine level will rise. Normal is about 1 for an average adult. Infants that have little muscle will have lower normal levels (0.2). Muscle bound weight lifters may have a higher normal creatinine.

Creatinine clearance is technically the amount of blood that is "cleared" of creatinine per time period. It is usually expressed in ml per minute. Normal is 120 ml/min for an adult. It is roughly, inversely related to serum creatinine: If the clearance drops to one half of the old level, the serum creatinine doubles (in the steady state). So for an adult, serum creatinine of 2 is roughly a creatinine clearance of 60 ml/min; creatinine 3 is roughly a clearance of 30; creatinine of 4 is roughly a clearance of 15, etc. So why didn't the creatinine rise to only 2 when a kidney was removed? (I said it would rise to 1.8) The answer is that the remaining kidney "hyperfilters" and seems to work harder, therefore kidney function is not quite halved.

Usually, an adult will need dialysis because symptoms of kidney failure appear at a clearance of less than 10 ml/min. Creatinine clearance has to be measured by urine collection (usually 12 or 24 hours). It is a more precise estimate of kidney function than serum creatinine since it does not depend on the amount of muscle one has.

Note that the units used in the United States are milligrams per deciliter (mg/dl). To convert to international units (micromoles per liter) multiply the creatinine (in mg/dl) by 88. Thus a serum creatinine of 2mg/dl is the same as 176 micromoles per liter.

Normal Values:

Normal value = less than 1.5 MG/DL
Accepted dialysis normal = 10-20 MG/DL

Varies with muscle mass. Elderly may have lower creatinine due to loss of muscle mass. Type II Diabetics have an acceptable range of 4-6 MG/DL. Should remain about the same as at start of dialysis from treatment to treatment. Only the most muscular of individuals should have values in the upper range. Desirable levels are in the low teens.

Causes of Abnormal Values:

Causes of abnormal levels:

  • inadequate "real" dialysis time
  • increase in muscle mass

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

Non-specific symptoms, but should be closely monitored with special attention to unsteady values. Any changes, especially increases, should be discussed with your care team immediately.They may indicate a failing access

Name of Test:

6. CO2 (Bicarb)

Normal Values:

Normal value = 22-32 MEQ/L
Dialysis normal = not less than 18 MEQ/L

Causes of Abnormal Values:

Causes of abnormal levels:

  • Eating to much protein, and creating a more acid blood, thus lowering CO2

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • Rapid breathing and shortness of breath
  • Acidosis in Type I Diabetics

Name of Test:

7. Glucose

Normal Values:

Normal value = 65-115 MG/DL
Accepted dialysis normal = Same 65-115 MG/DL

Causes of Abnormal Values:

HIGH:

  • Diabetes

LOW:

  • persistent uremia

Will be slightly higher within 1-3 hours after eating a meal.

Signs and Symptoms:

Signs and symptoms associated with high levels:

  • Excessive thirst

Name of Test:

8. Hematocrit (Hct)

Normal Values:

Normal value: % of total blood volume made up of red blood cells

  • Males = 40% - 54%
  • Females = 37% - 47%

Dialysis normal (following Medicare guideline)

  • 30% - 36% (gender non-specific)

Causes of Abnormal Values:

Causes of abnormal levels:

  • decreased production of red blood cells
  • blood loss during or after dialysis
  • shortened survival time of red blood cells

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • Fatigue
  • shortness of breath
  • chest pain on exertion (if underlying heart disease is present)

Name of Test:

9. Magnesium (Mg)

Normal Values:

Normal value = 1.7 - 2.3 MG/DL
Dialysis normal = Same 1.7 - 2.3 MG/DL

Causes of Abnormal Values:

Causes of abnormal levels:

  • elevated due to taking phosphate binder containing magnesium
  • ingesting medication such as milk of magnesia or citrate of magnesium

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • decreased mental function ranging from drowsiness to coma in severe states
  • decreased tendon reflex leading to paralysis
  • Nausea / vomiting
  • hypotension due to dilated blood vessels

Name of Test:

10. Sodium (Na)

Normal Values:

Normal value = 135 - 147 MEQ/L
Dialysis normal = Same 135 -147 MEQ/L

Causes of Abnormal Values:

Causes of abnormal levels:

  • eating too much salt (found in canned vegetables, potato chips, bacon, etc.)
  • High sodium levels in diaysate

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • thirst - leads to drinking more fluids and results in fluid weight gain
  • elevated blood pressure (hypertension)
  • shortness of breath

Note: Lower levels in your dialysate will cause you to be less thirsty. But lower levels will also lead to lower blood pressure. As long as your blood pressure will stay high enough to tolerate them, constnat dialysate levels as low as 135 to 137 will significantly reduce thirst.

(If you are to tolerate such low levels you must limit your weight gain to 3 or 4 pounds between treatments. Lowering your weight gain may seem almost impossible if your blood sodium is high already. It is much easier once your blood levels become lower)

While gradually lowering sodum levels during diaysis ("sodium modeling") is better than high levels during the entire run, constant low levels during the run are even better in allowing you to leave the dialysis session with a low level of sodium in your body and thus a resulting decrease in thirst between treatments.

Name of Test:

11.Phosphorus (PO4)

Normal Values:

Normal value = 2.5 - 4.5 MG/DL
Dialysis normal = 3.5 - 5.5 MG/DL

Causes of Abnormal Values:

Causes of abnormal levels:

LOW:

  • taking too much phosphate binder

HIGH:

  • not taking phosphate binders
  • eating high phosphorus foods such as milk, beans, cheese, and organ meats

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • causes elevated parathyroid hormone by lowering calcium (Ca). Elevated parathyroid hormone cannot be felt but will cause terribly serious bone destruction over time.
  • itchy skin

Name of Test:

12. Potassium

Normal Values:

Normal value = 3.5 - 5.4 MEQ/L
Dialysis normal = 4.00 - 6.5 MEQ/L

Causes of Abnormal Values:

Causes of abnormal levels:

HIGH:

  • eating too many foods high in potassium (bananas, oranges, potatoes, beans, nuts or replacement of cooking/table salt by a potassium containing substitute)

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

HIGH:

  • above 7.0 MEQ/L, extreme weakness (usually) prior to cardiac arrest.

Name of Test:

13. Albumin

Normal Values:

Normal value = 3.5 - 5.5 G/DL
Dialysis normal = Above 3.8 G/DL

Reason for test:

  • Measure of nutritional adequacy

Name of Test:

14. Ferritin

Normal Values:

Normal value = 10 - 350 NG/ML
Dialysis normal = 200 - 500 NG/ML

Reason for test:

  • a measure of "stored" iron

 

 

Name of Test:

16 Total Bilirubin

Normal Values:

Normal value = 0.2 - 1.2 MG/DL
Dialysis normal = Same

Reason for test:

  • elevated level indicates liver damage possibly from Hepatitis or obstructed bile ducts

Name of Test:

17. Total Protein

Normal Values:

Normal value = 6 - 8.5 GM/DL
Dialysis normal = Same

Reason for test:

  • observed for detecting abnormally low levels when increased intake of protein foods have been initiated

Name of Test:

18. Urea Reduction Ratio (URR)

Normal Values:

Dialysis normal = greater than 65%. This means that more than 60% of the urea (a waste product of the body) in your system has been removed by dialysis.

Reason for test:

  • determines dialysis efficiency

Name of Test:

19. KT/V

Normal Values:

Dialysis normal:
Hemodialysis = 1.3 or higher
Peritoneal Dialysis = 2.0 or higher

Reason for test: A different calculation of urea removal. Some centers prefer it to URR and some prefer URR to KT/V. There is no real difference in what is measured, the choice is simply a matter of preference.

  • checks dialysis efficiency

Name of Test:

20. Alkaline Phosphatase

Normal Values:

Normal value = 30 -115 U/ML
Dialysis normal = Same, Alkaline Phosphatase is derived from bone or liver.

Causes of Abnormal Values:

Causes of high levels: Hyperparathyroidism, liver disease

BONE

  • a marker for the severity of parathyroid caused bone disease

LIVER

  • a marker for diseases involving the liver or gall bladder

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • painful joints
  • weakened bones which could lead to severe pain and/or deterioration requiring surgery (hyperparathyroidism)

Name of Test:

21. Parathyroid Hormone (PTH)

Normal Values:

Normal value = Check "normals" for your lab, probably they will be below 200.
Dialysis normal = Same

Causes of Abnormal Values:

Causes of abnormal levels:

  • long term imbalance of calcium and phosphorus

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

HIGH

  • not taking phosphate binders
  • eating high phosphorus foods such as milk, beans, cheese, and organ meats

Name of Test:

22. SGOT

Normal Values:

Normal value = 10 - 50 U/ML
Dialysis normal = Same

Causes of Abnormal Values:

Causes of abnormal levels:

  • Hepatitis

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • sometimes, no symptoms are displayed
  • nausea and vomiting
  • abdominal cramping
  • fatigue (if severe liver damage is present)

Name of Test:

23. SGPT

Normal Values:

Normal value = 7 - 33
Dialysis normal = Same

Causes of Abnormal Values:

Causes of abnormal levels:

  • Hepatitis

Signs and Symptoms:

Signs and symptoms associated with abnormal levels:

  • sometimes, no symptoms are displayed
  • nausea and vomiting
  • abdominal cramping
  • fatigue (if severe liver damage is present)

 

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