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Sodium concentration in dialysate fluid (measured by mass concentration)

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

This test measures the sodium level in the dialysate fluid used during hemodialysis, helping doctors monitor how well your body is balancing electrolytes during treatment.

Quick summary

["Your sodium levels in dialysis fluid are critical for preventing dangerous imbalances during treatment."]

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

Key facts at a glance

LOINC
2949-6
Short code
Sodium Dial fld-sCnc
Synonyms
Sodium Dial fld-sCnc
Category
electrolyte
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
136
Ref high
145
Critical range
120 N/A – 160 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84295
SNOMED
110741000
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

Why Is This Test Done?

Doctors may order this test if you’re on dialysis to ensure your sodium levels in the fluid used for dialysis are appropriate for your body’s needs. Sodium is essential for nerve and muscle function, and improper levels can cause complications like swelling, high blood pressure, or even seizures. The dialysate fluid’s sodium concentration is adjusted based on your blood sodium levels and overall health status.

What Does This Test Tell You?

The test checks the sodium concentration in the dialysate fluid, which is the solution used to clean your blood during dialysis. If the sodium level is too high or too low, it could indicate problems with fluid balance, kidney function, or how well your body is responding to dialysis.

What to Expect Before the Test

You won’t need any special preparation for this test. It’s typically done during your dialysis session, and the dialysate fluid sample is collected as part of the procedure. No additional steps or fasting are required.

What to Expect During the Test

This test is a routine part of your dialysis treatment. A sample of the dialysate fluid is taken and sent to a lab for analysis. The process is quick and painless, as it’s integrated into your dialysis session.

Reference range

Adult: 136-145 mmol/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How does sodium concentration in dialysate fluid affect my health?
Sodium is vital for maintaining fluid balance, nerve function, and muscle contractions. If the dialysate sodium level is too high, it can cause fluid retention, high blood pressure, or even heart problems. If it’s too low, it may lead to dehydration, confusion, or muscle cramps. Your doctor will adjust the dialysate sodium level based on your blood sodium levels and overall health to prevent these issues.
What if my sodium levels in dialysate fluid are abnormal?
If your sodium levels in the dialysate fluid are outside the recommended range, your dialysis technician or doctor may adjust the dialysate solution to better match your body’s needs. You might also be advised to monitor your fluid intake and sodium-rich foods to help stabilize your levels.
Can diet or lifestyle changes affect this test?
While diet and lifestyle don’t directly affect dialysate sodium levels, they can influence your overall sodium balance. Avoiding excessive salt intake and staying hydrated can help maintain stable sodium levels in your blood, indirectly supporting better dialysis outcomes. Always follow your healthcare provider’s dietary recommendations.
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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