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Pyruvate kinase activity in red blood cells (PK activity)

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

This test measures how well your red blood cells can produce energy by breaking down a substance called pyruvate. Low levels may suggest a rare blood disorder.

Quick summary

["Red blood cell energy production can be checked for conditions like hereditary spherocytosis or other PK deficiencies."]

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

Key facts at a glance

LOINC
30481-6
Short code
Pyruvate Ur Ql
Synonyms
Pyruvate Ur Ql
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like fatigue, pale skin, or jaundice (yellow skin/high bilirubin), especially if they suspect a genetic blood disorder. It’s also used to confirm or monitor conditions like hereditary spherocytosis or other PK deficiencies.

What to Expect Before the Test

No special preparation is needed. A small blood sample will be drawn from a vein in your arm, similar to other blood tests. You may feel a slight pinch, but it’s usually over quickly.

What the Results Mean

Results are compared to a reference range for healthy adults. Very low levels of pyruvate kinase activity can indicate inherited red blood cell disorders, while normal or high levels suggest no significant issue.

Common Conditions Linked to Abnormal Results

Low pyruvate kinase activity is most strongly linked to hereditary spherocytosis or other PK deficiencies. These conditions can cause red blood cells to break easily, leading to anemia and other symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

PK RBC

Frequently asked questions

What symptoms might lead to this test?
Symptoms like unexplained fatigue, pale or yellowish skin, frequent bruising, or shortness of breath may prompt this test, especially if other blood disorders are suspected.
How does this test differ from other blood tests?
Unlike standard hemoglobin or complete blood count tests, this measures enzyme activity in red blood cells, specifically pyruvate kinase, which is critical for their energy supply.
Can lifestyle changes affect this test result?
No, this test measures an inherent enzyme activity in red blood cells and isn’t influenced by diet or activity levels. Results reflect your genetic and cellular biology.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

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