Module CC-12 · Version 1.0
Calcium, Phosphate, PTH, and Vitamin D
Integrate total calcium, albumin, ionized calcium, phosphate, magnesium, parathyroid hormone (PTH), and vitamin D markers into one interpretable pattern, and recognize when a total or corrected calcium result may not reflect the physiologically active fraction.
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Who this module is for
Clinical laboratory scientists and trainees who release or explain calcium, PTH, and vitamin D results on a core chemistry or blood-gas platform.
Learning objectives
- Distinguish total, albumin-bound, complexed, and ionized calcium and explain why only the ionized fraction is physiologically active
- Use PTH direction together with phosphate, magnesium, vitamin D, and renal function to organize the major mineral-metabolism patterns
- Recognize specimen pH, albumin state, biotin interference, renal disease, and assay generation as limits on how far a calcium or PTH result can be trusted
How completion works
Mark every required section done and answer every knowledge check in those sections correctly. The final save completes the module automatically.
Sources
15 sources
1. Physiology, Calcium and Physiology, Parathyroid, StatPearls, NCBI Bookshelf (updated editions)
Source note · peer-reviewed literature
2. CKD-Mineral and Bone Disorder: Core Curriculum 2011, and Chronic Kidney Disease-Mineral Bone Disorder, StatPearls, NCBI Bookshelf
Source note · peer-reviewed literature
3. Demay MB, et al. Vitamin D for the Prevention of Disease: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2024;109(8):1907-1947
Source note · professional society guidance
4. Use of Albumin-Adjusted Calcium Measurements in Clinical Practice, PMC review
Source note · peer-reviewed literature
5. CLSI C46, Blood Gas and pH Analysis and Related Measurements (current edition), CLSI standards catalog listing and sample chapter
Source note · consensus standard
6. CLSI PRE04, 1st edition (August 2023), Handling, Transport, Processing, and Storage of Blood Specimens for Routine Laboratory Examinations, CLSI standards catalog listing
Source note · consensus standard
7. 42 CFR Section 493.1291, Standard: Test report (Clinical Laboratory Improvement Amendments regulations), current e-CFR text via Cornell Legal Information Institute
Source note · federal regulation
8. U.S. FDA, Biotin Interference with Troponin Lab Tests - Assays Subject to Biotin Interference (safety communication updated from Nov 2017/2019 original)
Source note · federal regulation
9. Parathyroid Hormone Measurement in Chronic Kidney Disease: From Basics to Clinical Implications (peer-reviewed review, PMC)
Source note · peer-reviewed literature
10. IFCC Committee for Bone Metabolism, The path to the standardization of PTH: Is this a realistic possibility? position paper (PMC)
Source note · peer-reviewed literature
11. Roche Diagnostics, Elecsys PTH assay method sheet/package insert, cobas e platform
Source note · manufacturer labeling
12. Bilezikian JP, et al. Guidelines for the Management of Asymptomatic Primary Hyperparathyroidism: Summary Statement from the Fourth International Workshop, and companion Diagnosis of asymptomatic PHPT article, J Clin Endocrinol Metab 2014;99(10)
Source note · professional society guidance
13. KDIGO 2017 Clinical Practice Guideline Update for the Diagnosis, Evaluation, Prevention, and Treatment of Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD), Kidney International Supplements 2017 (PMC reproduction)
Source note · consensus standard
14. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease, Kidney International, published March 13, 2024
Source note · consensus standard
15. Mayo Clinic Laboratories test catalog entries for Calcium, Ionized; Phosphorus; Magnesium, Serum, and UCSF Health medical test reference for ionized calcium
Source note · manufacturer labeling