82310

Calcium; total

The CPT code 82310 represents a laboratory procedure for the quantitative measurement of total calcium concentration in a biological fluid, typically serum or plasma. This test determines the total amount of calcium, which includes both protein-bound and free (ionized) calcium. The measurement is critical for evaluating calcium metabolism, assessing parathyroid function, monitoring bone health, and diagnosing or managing various metabolic and endocrine disorders.

Clinical Indications

  • Evaluation of suspected hypercalcemia (e.g., hyperparathyroidism, malignancy, sarcoidosis, vitamin D intoxication).
  • Evaluation of suspected hypocalcemia (e.g., hypoparathyroidism, vitamin D deficiency, renal failure, malabsorption, pancreatitis).
  • Monitoring patients with chronic kidney disease (CKD) to assess mineral and bone disorder (CKD-MBD).
  • Monitoring patients with known parathyroid disorders (e.g., primary or secondary hyperparathyroidism, hypoparathyroidism).
  • Investigation of symptoms such as muscle cramps, tetany, muscle weakness, fatigue, bone pain, or cognitive changes that may suggest calcium imbalance.
  • Assessment of nutritional status, particularly in individuals with malabsorption or dietary restrictions.
  • Monitoring patients receiving medications that can affect calcium levels (e.g., diuretics, anticonvulsants, lithium).
  • Screening for metabolic bone diseases, including osteoporosis.

Procedure Steps

  1. **Patient Preparation:** Typically, no specific fasting is required, but consistent timing relative to meals may be important for follow-up testing. Inform the patient about the procedure.
  2. **Specimen Collection:** A venous blood sample is drawn, usually from an antecubital vein, into a serum separator tube (SST) or a heparinized plasma tube. Avoid prolonged tourniquet application as it can falsely elevate results.
  3. **Specimen Processing:** The collected blood sample is allowed to clot (for serum) or immediately processed (for plasma). The tube is then centrifuged to separate the serum or plasma from cellular components.
  4. **Laboratory Analysis:** The serum or plasma aliquot is loaded onto an automated chemistry analyzer. Total calcium concentration is measured using spectrophotometric methods, often involving a chromogenic reaction where calcium binds to a dye, producing a color change proportional to the calcium concentration, which is then measured.
  5. **Quality Control and Calibration:** Appropriate quality control materials and calibrators are run to ensure the accuracy and precision of the assay.
  6. **Result Reporting:** The measured total calcium concentration is reported, typically with reference ranges, for interpretation by the ordering physician.

Coding Guidelines

  • Report CPT code 82310 for the quantitative measurement of total calcium in a biological fluid.
  • If both total calcium (82310) and ionized calcium (82330) are performed, each should be reported separately if medically necessary and supported by documentation. These are distinct tests measuring different forms of calcium.
  • This code typically represents a single test performed per encounter, regardless of the number of aliquots or methodologies used to arrive at a single, final result.
  • Documentation in the patient's medical record must clearly support the medical necessity for performing the total calcium test, outlining the patient's symptoms, diagnosis, or reason for monitoring.
  • Bundling: Be aware of potential bundling edits (e.g., NCCI) when reporting 82310 with other chemistry panels. If 82310 is part of a comprehensive metabolic panel (CMP) or basic metabolic panel (BMP), it may not be separately billable if the panel code is used.

Associated ICD-10 Codes