Scope of Revision of the 2025 Summer Edition

The major focus of the 2025 summer edition was the systematic review of the following schedules: WK Endocrine System and WQ Obstetrics. Pregnancy. In addition to the systematic reviews of the WK and WQ schedules, other minor additions and changes were made.

Summary Statistics for the 2025 Summer Edition

2 schedule headers modified
61 class numbers added
2 range headers added
76 class number captions or notes modified
5 range headers modified
21 class numbers canceled
3 range headers deleted
61 index main headings added
219 index entries modified
63 index headings deleted

Systematic Reviews for the 2025 Summer Edition

Highlights from WK Endocrine System

24 NEW WK CLASS NUMBERS

New Class Number	Caption
WK 90	[Endocrine system] General works
WK 105	Androgens. Androgen antagonists
WK 110	Estrogens. Estrogen antagonists
WK 112	Estrogen replacement therapy
WK 220	Thyroid diseases (General or not elsewhere classified)
WK 517	Growth hormone
WK 812	Diabetes mellitus, Type I
WK 835.5	[Diabetes complications] Specific complications, A-Z
WK 835.5.A5	Diabetic angiopathies
WK 835.5.C2	Diabetic cardiomyopathies
WK 835.5.C6	Diabetic coma
WK 835.5.D2	Diabesity
WK 835.5.F5	Diabetic foot
WK 835.5.K4	Diabetic ketoacidosis
WK 835.5.N3	Diabetic nephropathies
WK 835.5.N6	Diabetic neuropathies
WK 835.5.R3	Diabetic retinopathy
WK 925	Corpus luteum hormones
WK 930	Gonadal steroid hormones
WK 932	Female gonadal steroid hormones
WK 933	Male gonadal steroid hormones
WK 935	Estradiol congeners
WK 940	Progesterone congeners
WK 945	Testicular hormones. Testosterone congeners

3 NEW CLASS NUMBERS IN OTHER SCHEDULES RELATED TO WK SYSTEMATIC REVIEW

New Class Number	Caption
QV 176	Tocolytic agents
QV 205	Hypoglycemic agents
WH 710	Lymphoid tissue

14 CANCELED WK CLASS NUMBERS

Canceled Class Number	Former Caption	New Instructions for Classification
WK 180	Renal hormones	Classify works on renal hormones in WJ 301
WK 201	[Thyroid gland] Anatomy. Histology. Embryology. Abnormalities	Classify works on the thyroid gland in WK 200
WK 267	[Thyroid diseases] Medical therapy	Classify works on hyperthyroidism in WK 265
WK 400	Thymus gland	Classify works on the thymus gland in WH 710
WK 501	[Pituitary gland] Anatomy. Histology. Embryology	Classify works on the pituitary gland in WK 500
WK 701	[Adrenal glands] Anatomy. Histology. Embryology	Classify works on the adrenal glands in WK 700
WK 702	[Adrenal glands] Physiology. Biochemistry	Classify works on the physiology of the adrenal glands in WK 700
WK 801	[Islets of Langerhans] Anatomy. Histology. Embryology	Classify works on the Islets of Langerhans and pancreatic hormones in WK 800
WK 802	[Islets of Langerhans] Physiology. Biochemistry	Classify works on the Islets of Langerhans and pancreatic hormones in WK 800
WK 825	Other hypoglycemic agents	Classify works on other hypoglycemic agents in QV 205
WK 830	Diabetic ketoacidosis. Diabetic coma	Classify works on diabetic coma in WK 835.5.C6; diabetic ketoacidosis in WK 835.5.K4
WK 840	Diabetes as a complication in other conditions	Classify works on the co-occurrence of diabetes and other conditions in WK 835
WK 870	Glycosurias	Classify works on glycosuria in QU 260.5.G6
WK 920	Placental hormones	Classify works on placental hormones in WQ 212

37 MODIFIED WK CLASS NUMBERS
7 MODIFIED CLASS NUMBER IN OTHER SCHEDULES RELATED TO WK SYSTEMATIC REVIEW

Highlights from WQ Obstetrics. Pregnancy

8 NEW WQ CLASS NUMBERS

New Class Number	Caption
WQ 180	Perinatal care
WQ 201	Pregnancy in Adolescence (General)
WQ 208.2	Artificial insemination
WQ 208.4	Fertilization in vitro
WQ 209.5	Fetal monitoring
WQ 254	High-Risk pregnancy
WQ 445	Induced abortion
WQ 507	Postpartum depression

6 NEW CLASS NUMBERS IN OTHER SCHEDULES RELATED TO WQ SYSTEMATIC REVIEW

New Class Number	Caption
WA 548	Reproductive health services (Table-G)
WA 548.1	[Reproductive health services] General coverage (Not Table-G)
WP 20.5	Reproductive medicine as a profession. Ethics. Peer review
WP 50	Reproductive health. Reproductive history (Table-G)
WP 50.1	[Reproductive health. Reproductive history] General coverage (Not Table-G)
WP 620	Reproductive techniques (General or not elsewhere classified)

2 CANCELED WQ CLASS NUMBERS

Deleted Class Number	Former Caption	New Instructions for Classification
WQ 90	Reproductive health surveys (Table-G)	Classify works on reproductive health surveys in WP 50
WQ 90.1	[Reproductive health surveys] General coverage (Not Table-G)	Classify works on reproductive health surveys without geographic coverage in WP 50.1

19 MODIFIED WQ CLASS NUMBERS
9 MODIFIED CLASS NUMBER IN OTHER SCHEDULES RELATED TO WQ SYSTEMATIC REVIEW