T1D glossary

Time in tight range (TITR)

Also called time in tight target range, TITR 70-140.

Time in tight range is the share of CGM values between 70 and 140 mg/dL (3.9 to 7.8 mmol/L), a narrower band than standard time in range. The 2017 CGM consensus listed 70 to 140 mg/dL as a secondary target range, and ADA's 2026 technology chapter cites a CGM study that reported it next to TIR. (ADA Standards of Care 2026, section 7; International consensus on CGM use, 2017)

Formula

TITR (%) = CGM values from 70 to 140 mg/dL ÷ all CGM values × 100

Worked example

Over 14 days, 2,016 of 4,032 values between 70 and 140 mg/dL is 50% TITR. The same two weeks can show a TIR of 72%, because every value from 141 to 180 mg/dL (7.8 to 10.0 mmol/L) counts for TIR and not for TITR.

Related terms

• Time in range
• Time above range

Sources, quoted

• ADA Standards of Care 2026, section 7: “increase in time in tight target range (70–140 mg/dL [3.9–7.8 mmol/L])”
• International consensus on CGM use, 2017: “Secondary 70–140 (3.9–7.8)”

Every quote above is checked against its source page before each update of this site; last checked 2026-10-06. The worked example is our own arithmetic. This page explains a term; it is not advice for a person's treatment.