Date of Last Blood Collection (Lab Test Closure Time)
This test records when your blood sample was taken and processed in the lab, not a measurement of any substance in your blood.
["It helps track when your bloodwork was completed for follow-up or billing purposes."]
Key facts at a glance
- LOINC
- 71504-5
- Short code
- DATECLOSED
- Synonyms
- —
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- esrd
- 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
This test does not measure any chemical, hormone, or cell in your blood. Instead, it captures the timestamp when your blood sample was fully processed in the lab, including when it was collected, centrifuged, and prepared for analysis. This information is used internally by healthcare providers to manage test results and scheduling.
Why It Matters in Your Care
While this test doesn’t provide diagnostic information, it ensures your bloodwork is accurately documented for medical records, insurance claims, and follow-up appointments. It helps healthcare teams track when tests were completed so they can review results promptly.
Common Uses and When It Might Be Ordered
This test is typically ordered as part of routine blood draws or when a lab needs to confirm the timing of sample processing. It’s not used for diagnosing conditions but is essential for administrative and logistical purposes in healthcare settings.
Clinical Significance
This test alone does not contribute to medical decisions. However, it ensures your blood sample was handled correctly and processed within standard timelines, which is critical for maintaining the accuracy of other tests performed on the same sample.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test does not provide any clinical data about your health. It serves as a record-keeping measure to confirm when your bloodwork was completed, ensuring proper documentation for your healthcare provider’s records and billing processes.
Frequently asked questions
Why is this test called a ‘date-closed’ test?
Does this test affect my treatment or diagnosis?
Can I request this test for a specific reason?
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