H

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Haematemesis	Hirschsprung's disease
Haematuria	Hirsutism
Haemochromatosis	Histoplasmosis
Haemodialysis complications	HIT
Haemoglobin variants	HIV infection
Haemoglobinopathy	Hodgkin's disease
Haemoglobinuria	Homocysteinaemia
Haemolysis	Hookworm infection
Haemolysis - neonatal	HSV infection
Haemolytic anaemia	HTLV-I/HTLV-II infection
Haemolytic disease of the newborn	Human papillomavirus infection
Haemolytic uraemic syndrome	Huntington disease
Haemophilia	Hydatid disease
Haemophilus ducreyi infection	Hydatidiform mole
Haemophilus influenzae infection	Hydrops fetalis
Haemoptysis	Hyperaldosteronism
Haemorrhagic disease of the newborn	Hyperammonaemia
Haemosiderosis	Hyperbilirubinaemia
Hairy cell leukaemia	Hypercalcaemia
Hansen's disease	Hypercholesterolaemia
Hashimoto disease	Hypergammaglobulinaemia
Hay fever	Hyperglycaemia
Headache	Hyperkalaemia
Heavy chain disease	Hyperlipidaemia
Heavy metal exposure/toxicity	Hypernatraemia
Helicobacter pylori infection	Hyperparathyroidism
Henoch-Schönlein purpura	Hyperprolactinaemia
Heparin-induced thrombocytopenia (HIT)	Hypersplenism
Heparin therapy	Hypertension
Hepatic abscess	Hyperthyroidism
Hepatic failure	Hyperthyroxinaemia (euthyroid)
Hepatitis	Hyperuricaemia
Hepatitis A virus infection	Hyperviscosity syndrome
Hepatitis B virus infection	Hypoalbuminaemia
Hepatitis C virus infection	Hypoaldosteronism
Hepatitis D virus infection	Hypocalcaemia
Hepatitis E virus infection	Hypogammaglobulinaemia
Hepatitis G virus infection	Hypoglycaemia
Hepatocellular carcinoma	Hypokalaemia
Hepatomegaly	Hypomagnesaemia
Hereditary angioedema	Hyponatraemia
Hereditary elliptocytosis	Hypoparathyroidism
Hereditary spherocytosis	Hypopituitarism
Herpes simplex infection	Hyposplenism
Herpes zoster infection	Hypothyroidism
Hib infection	Hypothyroxinaemia (euthyroid)