6.4 Blood Chemistries

6.4 Blood Chemistries

Quick Answer: The basic metabolic panel (BMP) and comprehensive metabolic panel (CMP) are broad screening tools that a DC uses less for diagnosing musculoskeletal disease directly and more for catching metabolic bone disease, undiagnosed diabetes, cardiovascular risk, and organ dysfunction before recommending exercise programs, supplements, or over-the-counter analgesics.

BMP vs. CMP: What's Different

The CMP is simply the BMP with a liver panel added on, which is why it is ordered whenever hepatic function or the bone-versus-liver origin of an elevated ALP needs to be sorted out.

Calcium and Alkaline Phosphatase: The Bone Disease Pair

Calcium and ALP are read together because each metabolic bone disease produces a distinct combination:

The exam-relevant nuance is that ALP is not specific to bone — the liver also produces it. When ALP is elevated and the source is unclear, a GGT (gamma-glutamyl transferase) test or ALP isoenzyme test clarifies the origin: GGT rises with liver disease but not bone disease, so a high ALP with a normal GGT points to bone as the source. Multiple myeloma is the classic exception to the rule that a high ALP means active bone turnover — lytic lesions in myeloma typically do not raise ALP because osteoblastic activity is suppressed rather than stimulated.

Glucose

Fasting glucose (or hemoglobin A1c for a longer-term average) screens for prediabetes and diabetes. This matters directly to chiropractic practice for two reasons: first, undiagnosed diabetic peripheral neuropathy can present as vague extremity pain, numbness, or weakness that mimics a radiculopathy or entrapment syndrome; second, before prescribing an active rehabilitation or exercise program, a DC should know whether a patient's glucose control is stable enough to tolerate increased activity without risk of hypoglycemia or delayed healing from minor injuries.

Lipid Panel

Total cholesterol, LDL, HDL, and triglycerides establish cardiovascular risk. A DC uses this information primarily as a safety check before recommending exercise intensity or cardio-based rehabilitation for a deconditioned patient with unaddressed dyslipidemia, and as a prompt for appropriate referral or comanagement with the patient's primary care provider rather than treatment within chiropractic scope.

Liver and Kidney Function Before Medications and Supplements

AST, ALT, and total bilirubin reflect hepatocellular health; BUN and creatinine (often expressed as estimated GFR) reflect kidney filtration. These values matter directly to a DC's counseling role:

• NSAIDs and acetaminophen: A patient with elevated liver enzymes or reduced renal function is at higher risk for drug-related toxicity from over-the-counter analgesics they may be using for musculoskeletal pain, and a DC advising on conservative pain management should factor this in before encouraging continued OTC use.
• Herbal and high-dose vitamin supplements: Certain botanicals and mega-dose fat-soluble vitamins (A, D) are hepatotoxic or nephrotoxic with prolonged use, and a documented baseline liver/kidney panel is the objective check before recommending or continuing a supplement regimen, especially in a patient already on other medications metabolized by the same pathways (for example, statins, which are also monitored with liver enzymes).
• Drug interactions: Statins, certain antibiotics, and many chronic medications are cleared renally or hepatically; reduced organ function changes how those drugs behave and raises the threshold for adding anything new, including supplements, without medical coordination.

A Combined Case Example

A 58-year-old patient with diffuse bone pain, mild anemia, an isolated markedly elevated ALP, and normal calcium and GGT presents a pattern most consistent with Paget's disease of bone rather than a metastatic or hyperparathyroid process — the normal calcium and normal GGT are what rule out the competing diagnoses. This is precisely the kind of multi-panel reasoning Part III rewards: no single chemistry value is read in isolation.

Quick Reference: When Each Test Changes Management

Blood chemistries close the loop on the Clinical Laboratory domain: urinalysis and hematology catch acute red flags, serology sharpens rheumatologic and infectious differentials, and the metabolic panels confirm the metabolic and organ-function context that makes every downstream recommendation — exercise, supplements, or referral — safe.