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Hemoglobin (Hb) or Hematocrit (Hct) Measurement Per Dialysis Session

Published: August 9, 2026Updated: August 16, 2026

This test measures your blood’s hemoglobin (red blood cell protein) or hematocrit (blood’s red cell volume) after each dialysis session to monitor how well your blood is being processed.

Quick summary

["Dialysis sessions help remove waste and excess fluids from your blood, and this test helps track your blood’s composition post-treatment."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
68489-4
Short code
DIALYSISHSPERSESSION
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

Hemoglobin (Hb) is the protein in red blood cells that carries oxygen throughout your body. Hematocrit (Hct) is the percentage of red blood cells in your blood. These levels are critical for assessing how well your body is receiving oxygen and how effectively your dialysis is functioning. During dialysis, waste and fluid are filtered out, so your levels may change after each session.

Why It Matters During Dialysis

Dialysis patients often have lower than normal hemoglobin or hematocrit levels due to kidney disease, which can cause anemia. Measuring these levels helps healthcare providers adjust your dialysis settings to ensure you’re receiving adequate oxygen and avoiding complications like fatigue or shortness of breath.

How It’s Performed

A small blood sample is taken from your arm or other vein after each dialysis session. The sample is sent to a lab where hemoglobin and hematocrit are measured using standard laboratory techniques. This helps track trends over time rather than just a single snapshot.

What the Results Mean

Results may show whether your hemoglobin or hematocrit levels are stable or need adjustment. For example, consistently low levels might indicate your dialysis isn’t removing enough waste or fluid, while high levels could signal dehydration or other issues. Your healthcare team will interpret these results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How often should I expect this test?
This test is typically performed after each dialysis session to monitor immediate changes in your blood composition. Your dialysis team will determine the frequency based on your specific needs, but it may be done daily or as needed to ensure your treatment is effective.
What if my levels are unusually low or high?
Unusually low levels may prompt adjustments to your dialysis settings, such as increasing fluid removal or adding erythropoiesis-stimulating agents (medications to boost red blood cell production). High levels could signal dehydration, which may require more fluid intake or adjustments to your dialysis time.
Can diet or supplements affect these results?
Yes, certain foods (like iron-rich foods) or supplements (such as iron or vitamin B12) can influence hemoglobin levels. If you’re taking supplements, discuss them with your healthcare provider to avoid interfering with your dialysis monitoring.
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy