An isolated growth hormone deficiency characterized by autosomal recessive inheritance of low but detectable levels of GH, short stature, significantly retarded bone age, and a positive response and immunologic tolerance to growth hormone therapy that has material basis in mutation in the GH1 or GHRHR genes on chromosomes 17q23.3 and 7p14.3, respectively. The disease is isolated growth hormone deficiency type IB (Monarch Disease Ontology term MONDO_0013006). Also known as: IGHD IB, congenital IGHD type IB, congenital isolated GH deficiency type IB, congenital isolated growth hormone deficiency type IB, dwarfism of Sindh, growth hormone deficiency, isolated, type IB.