How to give insulin to the patient based on sugal level Teach me the d

How to give insulin to the patient based on sugal level Teach me the dosing

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American Diabetes Association Standards of Care 2026 insulin hypoglycemia blood glucose treatment

Do not choose an insulin dose from the glucose number alone. The safe dose depends on:

Diabetes type, especially type 1 versus type 2
Insulin type: rapid-acting, regular, NPH, or long-acting
Current prescribed basal and meal doses
Whether the patient is eating, vomiting, fasting, or unwell
Kidney function, age, body weight, infection, steroid medicines, pregnancy
Their own correction scale and insulin sensitivity

Using a random “sliding scale” can cause severe low sugar or diabetic ketoacidosis. Correction insulin should be based on a prescriber-provided individualized plan, not a universal chart. Hospital references also discourage correction-only sliding-scale insulin as the sole regimen.

Safe practical approach

1. First check the glucose unit

mg/dL: common in India/US, for example 180 mg/dL
mmol/L: used in some countries, for example 10 mmol/L
Conversion: mmol/L × 18 = mg/dL.

2. If glucose is low: do not give extra insulin

If blood sugar is <70 mg/dL (3.9 mmol/L):

If awake and able to swallow: give 15 g fast sugar, such as 3 teaspoons sugar in water, glucose tablets, or 150 mL regular juice.
Recheck after 15 minutes and repeat if still <70.
If confused, unconscious, having seizures, cannot swallow, or glucose stays low: seek emergency help. Give glucagon only if it has been prescribed and someone is trained to use it.

The ADA recommends treating hypoglycemia promptly, rechecking every 15 minutes, and continuing treatment until glucose is above 70 mg/dL. See the ADA hospital-care guidance.

3. If glucose is high

Give only the correction dose written in the patient’s own prescription/chart.
For mealtime rapid insulin, give the prescribed meal dose plus prescribed correction dose only if the patient is going to eat and is not vomiting.
Do not repeat rapid-acting insulin too soon. It can keep lowering glucose for about 3-5 hours, so repeated “extra” doses can stack and cause dangerous hypoglycemia.
Long-acting insulin is generally taken at its scheduled dose, not adjusted dose-by-dose for one reading, unless the prescriber has specifically taught a titration plan.

4. When high sugar needs urgent assessment

Seek urgent medical care, particularly in type 1 diabetes, if:

Glucose remains >250 mg/dL (13.9 mmol/L) with ketones
Glucose is >300 mg/dL (16.7 mmol/L) and the person is ill
Vomiting, abdominal pain, rapid/deep breathing, drowsiness, confusion, or dehydration occurs
Insulin has been missed or pump delivery may have failed

About correction-dose formulas

Clinicians sometimes calculate an individualized correction factor, for example:

Correction dose = (current glucose - target glucose) ÷ insulin sensitivity factor

But the sensitivity factor is patient-specific and differs by insulin regimen. This is not safe to calculate for a particular patient without their total daily insulin dose, insulin type, diabetes type, food intake, ketones, renal function, and a clinician’s plan.

If you share:

age and diabetes type,
insulin name(s),
prescribed doses or the existing sliding-scale sheet,
current glucose with unit,
whether the patient is eating or vomiting, and
ketone result if glucose is high,

I can help you interpret the prescribed plan safely, but a prescriber or diabetes nurse should set or change the actual doses.

Age 22 Type 1 diabetes Human actrapid Current glucose level 340 before food Eating little bit Low ketones

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type 1 diabetes sick day blood glucose 340 ketones guidance correction insulin ADA 2026

At 340 mg/dL (18.9 mmol/L) with type 1 diabetes and ketones present, do not guess an Actrapid dose. You need the patient’s own written correction factor/sliding scale and usual meal dose. Giving an arbitrary number of units can cause severe hypoglycemia or fail to prevent DKA.

What to do now

Give the usual prescribed Actrapid meal dose plus only the prescribed correction dose from their diabetes plan.
- Actrapid is regular human insulin and is generally injected 30 minutes before eating.
- Since they are eating only a little, do not give a usual full food dose unless that is how their clinician instructed them to handle reduced meals.
Do not miss their basal/background insulin (for example NPH, glargine, detemir, degludec). Type 1 diabetes requires ongoing basal insulin even when appetite is poor.
Drink water or sugar-free fluids frequently, if they can keep fluids down.
Recheck glucose and ketones in 2 hours. Do not give another unplanned Actrapid correction before the interval specified in their plan. Regular insulin remains active for several hours, so early repeat doses can stack.
Avoid exercise while glucose is this high and ketones are positive.

Get urgent medical advice now

Because glucose is over 300 mg/dL and ketones are present, contact their diabetes clinician/urgent-care service now, especially if you do not have their correction chart. The ADA advises urgent assessment if glucose stays above 300 mg/dL for two readings despite corrections, or if there is uncertainty about insulin doses while sick. See the ADA sick-day guide.

Go to emergency care immediately for:

Vomiting or inability to drink
Increasing ketones, or moderate/large ketones
Abdominal pain, deep/rapid breathing, fruity breath
Drowsiness, confusion, severe weakness, or dehydration

Please send the exact insulin prescription or correction chart, including:

usual Actrapid before each meal
basal insulin name and dose
their correction factor, such as “1 unit lowers ___ mg/dL,” or a written sliding scale
when the last Actrapid dose was given
ketone result: urine trace/small/moderate or blood value in mmol/L

I can then help you read the prescribed chart, but I cannot safely invent the number of units for this patient.

Just tell me the dose

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I can’t safely tell you a number of Actrapid units for this person. At 340 mg/dL with ketones, the correct dose depends on their established correction factor, usual meal dose, last insulin dose, body weight, and basal insulin. Guessing can cause a severe low or delay treatment of DKA.

Call their diabetes doctor or local emergency/urgent-care service now for the exact correction dose.

Until then:

Do not skip their prescribed basal insulin.
Give water or sugar-free fluids.
Do not exercise.
Recheck glucose and ketones in 2 hours.
Go to emergency care now if vomiting, stomach pain, deep/fast breathing, confusion, drowsiness, worsening ketones, or inability to drink occurs.

I'm a resident doctor in hospital asking for educational purpose

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adult type 1 diabetes sick day small ketones supplemental insulin percentage total daily dose protocol

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"type 1 diabetes" AND "ketone" AND "sick day"

For an educational hospital approach, first distinguish small ketones from evolving DKA.

Scenario

22 years, type 1 DM
Premeal glucose 340 mg/dL = 18.9 mmol/L
Eating a little
“Low ketones” should be quantified:
- Blood beta-hydroxybutyrate 0.6-1.5 mmol/L, or
- Urine ketones trace/small

Check bedside status, hydration, vitals, precipitant, and obtain VBG, electrolytes, bicarbonate, anion gap, creatinine, and serum beta-hydroxybutyrate if ketones are present. If acidosis or significant ketosis is present, use your hospital DKA pathway, usually IV insulin and fluids rather than ad hoc SC correction.

If clinically well, no acidosis, and blood ketones are 0.6-1.5 mmol/L

A commonly used type 1 diabetes sick-day protocol is:

Supplemental insulin

Give an additional 0.1 unit/kg SC of short/quick-acting insulin, on top of the patient’s usual meal carbohydrate dose.

Or, if total daily insulin dose (TDD) is known:

Additional dose = 10% of the usual TDD

Examples:

Weight	0.1 unit/kg supplemental insulin
50 kg	5 units
60 kg	6 units
70 kg	7 units
80 kg	8 units
90 kg	9 units

So, for example, a stable 70 kg patient with BG 340 mg/dL and blood ketones 0.6-1.5 mmol/L would receive:

Their usual carbohydrate meal bolus based on their insulin:carbohydrate ratio, plus
7 units supplemental correction insulin by this sick-day protocol,
Plus ongoing basal insulin.

This is a protocol-derived educational example, not a replacement for the hospital’s endorsed insulin order set. NHS sick-day guidance describes 10% of TDD for blood ketones 0.7-1.5 mmol/L, and DAFNE sick-day rules use similar supplemental dosing for significant ketones.

Important Actrapid point

The referenced pathways usually say “quick-acting” insulin, generally rapid-acting analogues. Actrapid is soluble regular insulin:

onset about 30 minutes
peak about 2-3 hours
duration about 5-7 hours

Therefore:

Administer Actrapid about 30 minutes pre-meal if reliably eating.
Do not stack repeat Actrapid corrections every 2 hours without senior/endocrine approval or a specific protocol, because insulin-on-board persists longer than with aspart/lispro.
Recheck glucose and ketones in 2 hours, but use the local protocol for any further Actrapid dose. Regular insulin’s longer action should make you more cautious about redosing.

Escalate to DKA protocol / senior review if

Blood ketones ≥1.5 mmol/L, or rising
Urine ketones more than small/trace
Bicarbonate low, anion gap elevated, or VBG acidemia
Vomiting, abdominal pain, Kussmaul respiration, dehydration, drowsiness, or hemodynamic instability
Glucose/ketones fail to improve after the initial correction

For blood ketones ≥1.5 mmol/L, some sick-day protocols use 20% of TDD or 0.2 U/kg supplemental insulin, but that level merits urgent senior review and evaluation for DKA rather than simply escalating ward correction doses. Continue basal insulin throughout unless a specific DKA infusion protocol replaces it.

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