Seven columns are enough for a blood pressure and blood sugar log: date, clock time, what was measured, the reading, its unit, a timing label and notes, with one row per reading. A blood sugar value needs its timing label, such as on waking or after a meal, to be readable.
The two records often belong together: the American Diabetes Association's 2026 Standards of Care say hypertension is common in type 1 and type 2 diabetes, and recommend counselling people with both conditions to monitor their blood pressure at home after appropriate education. The timing differs. The CDC lists four usual moments for a blood sugar check, and the American Heart Association asks for two blood pressure readings one minute apart.
What columns does a blood pressure and blood sugar log need?
A combined blood pressure and blood sugar log needs one row per reading and seven columns: date, clock time, measurement type, reading, unit, timing label and notes. Blood pressure rows hold systolic, diastolic and pulse; blood sugar rows hold one glucose value with its unit, mg/dL or mmol/L. Keeping every reading in one chronological table shows how both records fall across the same days without mixing the numbers.
| Column | What to write | Blood pressure (invented example) | Blood sugar (invented example) |
|---|---|---|---|
| Date | The month as a word, or a stated format | 14 Sep | 14 Sep |
| Clock time | When the reading was taken | 07:15 | 06:30 |
| Type | What was measured | Blood pressure | Blood sugar |
| Reading | Exactly what the device showed | 128/82, pulse 66 | 97 |
| Unit | As shown on the device | mmHg, bpm | mg/dL |
| Timing label | The moment it belongs to | Morning, 1 of 2 | On waking, nothing eaten |
| Notes | Anything that changes the context | Left arm | New strip pack |
For the notes, MedlinePlus suggests recording carbohydrates eaten, the type and dose of diabetes medicine, exercise and its length, and anything unusual such as stress or illness.
- Ask your clinician which readings and timing labels they want, and write the labels at the top of the page so every row uses the same words.
- State the date format in the header so 3/9 cannot mean two different days, a problem the blood pressure log guide covers.
- Give each reading its own row, so a sitting with two blood pressure readings takes two rows.
- Copy each reading straight from the device, and for an after-meal reading add the time the meal started.
When are blood sugar readings usually taken?
The CDC lists four usual times to check blood sugar: on first waking, before eating or drinking anything; before a meal; two hours after a meal; and at bedtime. MedlinePlus notes that not everyone with diabetes needs to check every day, so whether, how often and at which of those times to check is set by your clinician rather than by a log template.
The label matters because goals differ by moment: the CDC's example targets are 80 to 130 mg/dL before a meal and under 180 mg/dL two hours after the start of a meal, and the CDC says targets may differ by age and other health problems. The ADA's 2026 goals are for nonpregnant adults and are meant to be individualised, so your own targets come from your clinician.
"After a meal" is not defined the same way everywhere:
| Source | "After a meal" means |
|---|---|
| CDC | Two hours after; its goals count from the start of the meal |
| American Diabetes Association, 2026 | 1 to 2 hours after the start of the meal |
| NHS | At least 90 minutes after eating, in its guidance on high readings |
So record clock times, not only the label. "Fasting" needs the same care: in the ADA's diagnostic criteria, used for lab tests, it means no calorie intake for at least 8 hours, so a label that says what happened, such as "on waking, nothing eaten since 22:00", is clearer on a home log.
Should blood pressure and blood sugar be measured at the same sitting?
Blood pressure and blood sugar do not have to be measured at the same sitting: the CDC's usual glucose check times and the American Heart Association's home blood pressure steps do not ask for the two to be taken together or in a set order. If both are taken at one sitting, the blood pressure reading still needs the AHA's preparation and quiet rest, and the glucose value keeps its own clock time and timing label.
The full preparation is in how and when to take blood pressure at home.
How do you convert blood sugar between mg/dL and mmol/L?
To convert blood glucose, divide a mg/dL value by 18 to get mmol/L, or multiply a mmol/L value by 18 to get mg/dL. The factor comes from the molar mass of glucose, 180.16 g/mol, which gives a more precise factor of 18.016. Round mmol/L to one decimal place, as the ADA's 2026 goal tables do, and mg/dL to a whole number. The factor applies to glucose only, not to HbA1c or cholesterol.
Units usually depend on the country: CDC and ADA patient pages in the US use mg/dL, while the NHS uses mmol/L, and the ADA Standards list both. This table is for converting records, not a list of targets.
| mg/dL | → mmol/L | mmol/L | → mg/dL |
|---|---|---|---|
| 60 | 3.3 | 3.5 | 63 |
| 90 | 5.0 | 5.0 | 90 |
| 120 | 6.7 | 7.0 | 126 |
| 180 | 10.0 | 8.0 | 144 |
| 200 | 11.1 | 10.0 | 180 |
| 300 | 16.7 | 15.0 | 270 |
Keep the value the meter showed in the row and write any conversion beside it.
Why can two blood sugar readings minutes apart differ?
Two blood sugar readings minutes apart can differ because no meter or strip is accurate 100% of the time, as MedlinePlus notes. The FDA's 2020 guidance asks makers of over-the-counter meters to show in accuracy studies that 95% of results fall within 15% of a laboratory comparison and 99% within 20%, so two strips used minutes apart can differ even on a meter that meets that expectation.
- Wash and dry your hands and follow your meter's instructions: the FDA says even small amounts of food or sugar on the fingers can affect results.
- If you repeat a check, log both results. Note a new strip pack or meter; the FDA's consumer advice covers strip storage, expiry and control-solution checks.
- If a reading is low or very high, follow the plan agreed with your clinician. The UK's NHS says to call 999 or go to A&E if you think you have high blood sugar and, among other signs, feel drowsy, confused or are breathing faster than usual.
How do you bring a combined log to an appointment?
Bring the log in date order, printed or exported, with blood pressure and blood sugar either in separate sections or as clearly labelled rows of one table, and bring the glucose meter and blood pressure monitor if they store readings. The American Diabetes Association says a glucose log gives the provider a good picture of how the body responds to the care plan.
- Cover the period your clinician asked for, untidy rows included.
- If you add averages, ask your clinician whether they want them, and keep the readings behind each average on the sheet.
- Bring the devices: the FDA suggests comparing your meter with laboratory results, and the American Heart Association says to bring a monitor with memory.
- Write your questions on the sheet. What to bring to a blood pressure appointment covers the blood pressure half.
Can one sheet hold blood pressure and blood sugar readings?
A single sheet holds blood pressure and blood sugar readings if it uses seven shared columns: date, clock time, type, reading, unit, timing label and notes. The free Monitor2Log printable log covers blood pressure only, so on paper either rule the seven columns by hand or keep glucose on a separate page. In a spreadsheet, give glucose its own number column so it never enters the blood pressure averages.
- Paper. The free printable blood pressure log has date, time, systolic, diastolic, optional pulse and notes columns, with one row per day and its date format printed in the header. For blood sugar, use a separate page with date, clock time, reading, unit, timing label and notes columns.
- Spreadsheet. How to make a blood pressure log in Excel or Google Sheets covers the set-up with separate systolic, diastolic and pulse columns. Add Type, Glucose, Unit and Timing label columns, so each glucose value sits in its own column; AVERAGE skips blank cells, as that guide explains, and a separate blood sugar tab works too.
- Continuous glucose monitors usually keep their own record in an app or reader. The FDA, clearing the first over-the-counter one in 2024, said users should not make medical decisions from it without their healthcare provider.
- The Monitor2Log diary keeps blood pressure and blood glucose on separate tabs of one signed-in account (the glucose tab appears after your first glucose reading), each with a chart, an Excel export and a print report that can include averages and highest and lowest values. Glucose is typed in mg/dL as a whole number, so multiply mmol/L readings by 18, round, and write the original mmol/L value in the notes. Timing buttons such as "Before a meal", "After a meal", "After waking" and "Before bed" are saved in the notes, and the report's averages cover every glucose reading in the chosen range, not each label. The photo scan reads blood pressure monitors and handwritten blood pressure pages only; it can misread digits, so every row is checked before saving. It is a record-keeping app, not a medical device.
Sources
- CDC, 2024, Manage Blood Sugar: usual check times and example targets by timing.
- American Diabetes Association, 2026, Standards of Care in Diabetes, Section 6: glycaemic goals and meal timing, with Section 2 (fasting), Section 10 (home blood pressure) and the Check Your Blood Glucose patient page linked above.
- American Heart Association, 2025, Home Blood Pressure Monitoring.
- MedlinePlus, US National Library of Medicine, 2026, Home blood sugar testing.
- U.S. Food and Drug Administration, 2020, guidance on over-the-counter blood glucose meters, with the 2017 meter tips, 2021 test-strip advice and 2024 CGM clearance linked above.
- NHS, 2026, High blood sugar (hyperglycaemia): mmol/L readings, after-eating timing and urgent-help signs.
General information only, not medical advice. When and how often to check, which labels to use and what your readings mean are for your own clinician to decide.