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Help with adding ISBLANK to a VLOOKUP function

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    Help with adding ISBLANK to a VLOOKUP function

    I have several spots in a spreadsheet that are utilizing VLOOKUP and ISNA so that if a sample number matches a corresponding value is returned and if there is no sample number that matches it returns -99 which indicates there is no value available. Below is an example of this formula.
    =IF(ISNA(VLOOKUP($I2,'PIC SW Corr'!$A$2:$W$801,23,FALSE)),-99,VLOOKUP($I2,'PIC SW Corr'!$A$2:$W$801,23,FALSE))
    The formula works well except for one thing. When a sample number exists on the other page, but a cell is empty (usually because a value will be added at a later date) it shows up as a 0 which of course messes up graphing. I was able to change the cell format where the formula is to make these problem cells show up blank, but what I really need is to have it show -99 indicating there is no value available. I suspect that I need to use ISBLANK function but am struggling with how to incorporate that into an already complex formula.
    Any suggestions?

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    Re: Help with adding ISBLANK to a VLOOKUP function

    Is the cell really blank or is a formula returning "" which will not register as TRUE when using ISBLANK formula. Will there be cases where it will legitimately be 0 that it is pulling back?

    Assuming it will never be zero, try
    IF(IFERROR(VLOOKUP($I2, 'PIC SW Corr'!$A$2:$W$801,23,FALSE),-99)=0, -99, IFERROR(VLOOKUP($I2, 'PIC SW Corr'!$A$2:$W$801,23,FALSE),-99))
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    Re: Help with adding ISBLANK to a VLOOKUP function

    There are times when the value will actually be 0. The cell is really blank (I've even double checked by clearing cell contents). I'm not sure I understand your first question though.

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    Re: Help with adding ISBLANK to a VLOOKUP function

    I think it might be working using this formula:
    =IF(ISNA(VLOOKUP($I2,'PIC SW Corr'!$A$2:$W$801,23,FALSE)),-99,IF(VLOOKUP($I2,'PIC SW Corr'!$A$2:$W$801,23,FALSE)="",-99,VLOOKUP($I2,'PIC SW Corr'!$A$2:$W$801,23,FALSE)))

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