Hemoglobin (Hb) or Hematocrit (Hct) Measurement Per Dialysis Session
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.
["Dialysis sessions help remove waste and excess fluids from your blood, and this test helps track your blood’s composition post-treatment."]
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?
What if my levels are unusually low or high?
Can diet or supplements affect these results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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