The type-based market taxonomy separates Lab-synthesized Heparin into low-molecular-weight (LMW), unfractionated (UF) and ultra-low-molecular-weight (ULMW) species, each occupying distinct clinical niches. LMW heparin, the largest type segment (>60 % value share), is preferred for outpatient thromboprophylaxis because of longer half-life and lower immunogenicity; biosimilar competition is intensifying, compressing prices by ~4 % CAGR but expanding volume as guidelines widen eligibility. Unfractionated lab-synthesized heparin retains a defensive 25 % share where rapid reversibility with protamine is mandatory (e.g., intra-operative anticoagulation); its synthesis cost remains the benchmark against which LMW premiums are negotiated. ULMW heparin, though nascent (<15 % share), exhibits superior anti-Xa selectivity and reduced HIT liability, commanding 2–3× LMW pricing and anchoring pipeline value for sponsors targeting paediatric and renal-impaired populations where accumulation risk is critical.