Below is a summary of the ideals a rat should be :


Physiological
Average Life Span Captivity: 24-42 months
  Wild: <1 year
Body (rectal) temperature 37.5-38.2oC
  99.5-100.8oF
Respiratory rate 70-150/min
Heart Rate 250-480 bpm
Blood pressure (60-90)/(75-120) mm Hg
Blood pressure Diastolic Diastolic 60-90 mm Hg
  Systolic 75-120 mm Hg
Body surface area 10.5 (wt. in grams)2/35
Body surface area (cm2)  9.1 x g0.66
Tidal volume 1.5-1.8 ml


Feeding
Daily food consumption 5 g/100 g bwt
Daily water consumption 8-11 ml/100 g bwt
Food consumption 10 g-100 g a day
Water consumption 10-12 ml or 100 g a day


Weight
Birth 5-6 g
Weaning 30-55g
Puberty 150-200 g
12 weeks Female: 150-270 g
  Male: 150-400 g
Adulthood Female: 250-500 g
  Male: 300-800 g


Reproductive
Breeding Onset 65-110 days
Oestrus Cycle Every 4-6 days
Oestrus Period Approx.12 hours
Gestation 21-23 days
Duration Of Mating Period 9-20 hours
Litter Size 6-14 (varied depending on age)
Nursing Period Approx. 28 days
Maximum milk yield 12-14 days postpartum


Developmental
Hair Coat 9 days
Incisors erupt 8-10 days
Eyes Open 10-12 days
Ear canal open 12-14 days
First molars erupt 19 days
Second molars erupt 21 days
Descent Of Testes 15-50 days
Third molars erupt 35 days
Puberty Females: 34-38 days
  Males: 39-47 days
Social maturity 22-26 weeks
Female Menopause 64-77 weeks


Haematological
Blood volume 5.6-7.1 ml/100 g bwt
Plasma volume 3.08-3.67 ml/100 g bwt
Red blood cell 7-10 x 106/µl
Haemoglobin 11-19 gm/dl
Packed cell volume 40.5-54%
Clotting time 2-5 min
Prothrombin time 8-4 sec
PTT 21.1 ± 3.7 sec
Fibrinogen 190 (150-230) mg/dl
Leukocyte count Total: 9(6-18) x 103/µl
  Neutrophils: 14-20%
  Lymphocytes: 69-86%
  Monocytes: 1-6%
  Eosinophils: 1-4%
  Basophils: Rare
Platelets 500-1,000 x 103/µl


Urological
Urine osmolality 1660 mOsm/kg of H2O
Urine output per day 5.5 ml/100 g bwt
Urine pH 7.5-8.5
Urine SG 1.04-1.07

References : 1, 5, 32, 33