Specimen:
Collect
- One Lavender (EDTA)
- One SST
Also Acceptable:
- One Pink Top (EDTA)
- One Red Top
Submit
- 1 mL (Min:0.5 mL) Serum in Standard Transport Tube. Submit Refrigerated. Submit in a Standard Transport Tube.
- 1 mL (Min:0.5 mL) Plasma in Standard Transport Tube. Submit Refrigerated. Submit in a Standard Transport Tube.
Also Acceptable:
- 2 mL (Min:1 mL) Serum in Standard Transport Tube. Submit Refrigerated. Submit in a Standard Transport Tube.
Special Handling
- Allow specimen to clot completely at room temperature
- Fasting Specimen is Preferred
- Serum/Plasma must be separated from cells ASAP!
EDTA plasma for PTH and SST serum for calcium. Unable to use EDTA plasma for calcium component.
Serum may be used for PTH but preference should be given to EDTA plasma.
Due to special handling, PTH cannot be added to previously drawn specimens.
If serum used for PTH-stability: Ambient 8hrs, RF 2 days, FZ 6 months.
This assay may be affected by high-dose biotin (vitamin B7), commonly found in supplements or therapies exceeding 100 mg/day (100,000 µg/day). Biotin can cause falsely high or low results in biotin-sensitive immunoassays. Due to variability in biotin metabolism, it is recommended that blood samples be collected at least 8 hours after the last biotin dose. Please assess supplement use prior to specimen collection if possible.
Rejection Criteria
- Grossly Hemolyzed Samples
- Whole blood
Stability
Ambient: 2 Day(s); Refrigerated: 3 Day(s); Frozen: 6 Month(s); Incubated: Unacceptable
Methodology
- Electrochemiluminescence Immunoassay
Performed
Mon-Fri
Reported
1-3 Day(s)
CPT Codes
- 82310
- 83970
Interpretive Data
Please see report for interpretive data.
This assay may be affected by high-dose biotin (vitamin B7), commonly found in supplements or therapies exceeding 100 mg/day (100,000 µg/day). Biotin can cause falsely high or low results in biotin-sensitive immunoassays. Due to variability in biotin metabolism, it is recommended that blood samples be collected at least 8 hours after the last biotin dose. Please assess supplement use prior to specimen collection if possible.
This assay may be affected by high-dose biotin (vitamin B7), commonly found in supplements or therapies exceeding 100 mg/day (100,000 µg/day). Biotin can cause falsely high or low results in biotin-sensitive immunoassays. Due to variability in biotin metabolism, it is recommended that blood samples be collected at least 8 hours after the last biotin dose. Please assess supplement use prior to specimen collection if possible.
Components
- 1016 - CALCIUM
- 5028 - PTH
Last Updated: October 13, 2025 @ 4:22 pm
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